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Chapter 9: Problem 3

Write balanced equations for the following processes: (a) Electrolysis of water (b) Treatment of sodium hydride with water (c) Treatment of calcium with water (d) Production of \(\mathrm{CH}_{4}\) from a carbide

Short Answer

Expert verified
a) \(2\mathrm{H}_{2}\mathrm{O}(l) \rightarrow 2\mathrm{H}_{2}(g) + \mathrm{O}_{2}(g)\) b) \(\mathrm{NaH}(s) + \mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{NaOH}(aq) + \mathrm{H}_{2}(g)\) c) \(\mathrm{Ca}(s) + 2\mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{Ca(OH)}_{2}(aq) + \mathrm{H}_{2}(g)\) d) \(\mathrm{CaC}_{2}(s) + 2\mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{Ca(OH)}_{2}(aq) + \mathrm{C}_{2}\mathrm{H}_{2}(g)\)

Step by step solution

01

Electrolysis of water

The electrolysis of water produces hydrogen and oxygen. The balanced chemical equation is: \[2\mathrm{H}_{2}\mathrm{O}(l) \rightarrow 2\mathrm{H}_{2}(g) + \mathrm{O}_{2}(g)\]
02

Treatment of sodium hydride with water

Sodium hydride reacts with water to produce sodium hydroxide and hydrogen. The Balanced chemical equation is: \[\mathrm{NaH}(s) + \mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{NaOH}(aq) + \mathrm{H}_{2}(g)\]
03

Treatment of calcium with water

Calcium reacts with water to produce calcium hydroxide and hydrogen. The balanced chemical equation is: \[\mathrm{Ca}(s) + 2\mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{Ca(OH)}_{2}(aq) + \mathrm{H}_{2}(g)\]
04

Production of \(\mathrm{CH}_{4}\) from a carbide

The reaction between calcium carbide and water produces acetylene. The balanced chemical equation is: \[\mathrm{CaC}_{2}(s) + 2\mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{Ca(OH)}_{2}(aq) + \mathrm{C}_{2}\mathrm{H}_{2}(g)\] Please note that methane \(\mathrm{CH}_{4}\) cannot be obtained from a carbide. It is the result of the reaction of carbon with hydrogen.

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Most popular questions from this chapter

Discuss the various methods used for the production of dihydrogen.

Differentiate between atomic dihydrogen and nascent hydrogen.

Give reasons for the following: (a) \(\mathrm{H}^{-}\) is larger than He. (b) NaH is strongly hydrophillic but \(\mathrm{GeH}_{4}\) is weakly hydrophillic. (c) Acetylene reacts with active metals to liberate hydrogen. (d) Ionic hydrides are more dense than the parent metal while interstitial hydrides are less dense than the parent metal. (e) Palladium is used as a catalyst for hydrogenation.

What is heavy water? How is it obtained? What are its pronerties?

Discuss the spin isomers of hydrogen. Is it possible to obtain pure para- hydrogen?
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